Investments in and Advances to Unconsolidated Affiliates - Schedule of Investments (Parenthetical) (Details)	Dec. 31, 2020	Dec. 31, 2018	Nov. 16, 2017
Broughton St. Portfolio Savannah, GA
Schedule of Equity Method Investments [Line Items]
Equity method investment, ownership percentage	100.00%
Core Portfolio
Schedule of Equity Method Investments [Line Items]
Equity method investment, ownership percentage	75.22%	61.11%	22.22%
Core Portfolio | Town Center
Schedule of Equity Method Investments [Line Items]
Equity method investment, ownership percentage	100.00%